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Difference among types: int, int32_t, __int32...

adairwu asked
Medium Priority
Last Modified: 2012-08-13

a quick question:

I saw different programs written by using different type notations for integer, like:


is there any difference? or what's the guideline i should follow when writing codes?

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Top Expert 2005
int is the only built-in type you mention. It is the native integer size for the processor.  Since the sizeof(int) is not fixed in C (as it is in Java), many programmers define types for 8, 16, 32, and 64 bit integers that are not ambiguous.   Recently, most systems are defining them in system header files (like types.h) using common nomenclature.  int32_t is common in Unix and gcc environments.  __int32 is favored by Microsoft (leading underscores used because it is not officially part of the ANSI standard).

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